c:if与s:if的基本使用

1.使用s:if判断字符串 
Java代码  

1. <s:if test="a!="ah"">  
2.         table0  
3.     </s:if>  

2.s:if判断null 

Java代码  

1. <s:if test="list!=null && list.size!=0">  
2.     <table border="1">  
3.         <tr><td>table1</td><tr>  
4.             <s:iterator value="list" id="u" status="st">  
5.                 <tr>  
6.                     <td><s:property value="#st.index" /></td>  
7.                     <td> <s:property value="[color=red]#u.id[/color]"/></td>  
8.                     <td> <s:property value="[color=red]username[/color]"/></td>  
9.                     <td> <s:property value="password"/></td>  
10.                 <tr>  
11.             </s:iterator>  
12.     </table>  
13.     </s:if>  

3.c:if判断是否为null 
Java代码  

1. <c:if test="${!empty list}">  <table border="1">  
2.     <tr><td colspan="3">table2</td><tr>  
3.     <c:forEach var="u" items="${list}" varStatus="sta">  
4.                 <tr>  
5.                    <td>${sta.index}</td>  
6.                    <td align="center"> ${u.id} </td>  
7.                    <td align="center"> ${u.username } </td>  
8.                    <td align="center"> ${u.password} </td>  
9.                 </tr>  
10.     </c:forEach>  
11.     </table>  
12.    </c:if>